Fixed Inductors

Part Number	Description / PDF	Quantity
MPX1D0624LR15 KEMET	FIXED IND 150NH 23.2A 2.3 MOHM	950
MPXV1D1770L680 KEMET	FIXED IND 68UH 5.5A 79.5 MOHM	78
SBCP-47HY390B KEMET	FIXED IND 39UH 790MA 213 MOHM TH	600
SBCP-11HY100H KEMET	FIXED IND 10UH 3.1A 40 MOHM TH	396
SBCP-80HY4R7H KEMET	FIXED IND 4.7UH 3.3A 40 MOHM TH	498
L0806B1R5JSWST KEMET	FIXED IND 1.5UH 350MA 470 MOHM	1965
MPX1D0830L6R8 KEMET	FIXED IND 6.8UH 6.8A 37.9 MOHM	980
MPX1D0624L3R3 KEMET	FIXED IND 3.3UH 6A 33.8 MOHM SMD	899
L0806BR68JSWST KEMET	FIXED IND 680NH 400MA 320 MOHM	1950
SBC4-150-232 KEMET	FIXED IND 15UH 2.3A 60 MOHM TH	2993
SBC7-221-132 KEMET	FIXED IND 220UH 1.3A 250 MOHM TH	9
MPX1D1264L3R3 KEMET	FIXED IND 3.3UH 19.7A 6.2 MOHM	241
MPCV1060L1R5 KEMET	FIXED IND 1.5UH 22A 2.75 MOHM	1000
SBCP-87HY820H KEMET	FIXED IND 82UH 1.1A 230 MOHM TH	499
SBC4-100-292 KEMET	FIXED IND 10UH 2.9A 40 MOHM TH	2921
SBC6-471-701 KEMET	FIXED IND 470UH 700MA 630 MOHM	1579
SBC1-6R8-182 KEMET	FIXED IND 6.8UH 1.8A 60 MOHM TH	476
MPX1D1250LR33 KEMET	FIXED IND 330NH 41.6A 1.3 MOHM	246
SBCP-87HY680H KEMET	FIXED IND 68UH 1.16A 190 MOHM TH	500
SBCP-80HY3R3H KEMET	FIXED IND 3.3UH 3.6A 40 MOHM TH	500

Fixed Inductors

1. Overview

Fixed inductors are passive electronic components designed to store energy in magnetic fields when electrical current flows through them. Unlike variable inductors, their inductance values remain constant during operation. These components play critical roles in filtering, signal processing, energy storage, and electromagnetic interference (EMI) suppression across modern electronics, including power supplies, communication systems, and automotive electronics.

2. Main Types and Functional Classification

Type	Functional Characteristics	Application Examples
Wirewound Inductors	High precision, high current handling, low resistance	Power supplies, DC-DC converters
Chip Inductors	Compact SMD package, stable performance at high frequencies	Mobile devices, RF circuits
Ferrite Bead Inductors	Effective high-frequency noise suppression	EMI filtering in digital circuits
Thin-Film Inductors	Ultra-compact, high Q-factor, tight tolerance	5G communication modules, IoT devices

3. Structure and Composition

Typical fixed inductors consist of:

Magnetic Core: Made from ferrite, powdered iron, or composite materials to concentrate magnetic flux
Coil Structure: Copper wire wound around the core (enamelled or silver-plated)
Encapsulation: Molded resin or ceramic coating for mechanical protection and insulation
Terminations: Solder-coated ends for PCB mounting (for SMD types) or leaded connections

4. Key Technical Specifications

Parameter	Description	Importance
Inductance (L)	Measured in henrys (H), determines energy storage capacity	Defines filtering/energy storage performance
Rated Current (I_rated)	Maximum DC current before saturation	Prevents core saturation and failure
DC Resistance (DCR)	Resistance of coil windings	Affects efficiency and thermal performance
Self-Resonant Frequency (SRF)	Frequency where inductor behaves as capacitor	Limits effective operating frequency range
Q Factor	Quality factor indicating efficiency	Higher Q = lower energy losses

5. Application Fields

Consumer Electronics: Smartphones, laptops, LED drivers
Industrial Equipment: Motor drives, power inverters
Automotive Systems: ECU modules, EV battery management
Telecom Infrastructure: Base station filters, optical transceivers

6. Leading Manufacturers and Products

Manufacturer	Representative Product	Key Features
Murata	LQH3NPN100M	10 H, 1.2A, 1.8 1.4mm chip inductor
TDK	MLZ2012A100T	100MHz SRF, 1.0 1.25mm for RF circuits
Vishay	IHLP2525CZER1R0M	1 H, 12A, composite construction
Coilcraft	0402DC-103J	10 H, 5% tolerance, ultra-low profile

7. Selection Guidelines

Key considerations during selection:

Calculate required inductance based on switching frequency and ripple current
Verify rated current exceeds maximum operating current by 20-30%
Select SRF higher than circuit operating frequency
Consider package size vs. thermal dissipation requirements
For EMI suppression: Choose ferrite beads with impedance curves matching target frequencies

8. Industry Trends

Current development trends include:

Miniaturization: Sub-0.5mm size inductors for wearable devices
High-Frequency Operation: Components supporting >10GHz 5G applications
Integrated Solutions: Combined inductor-filter modules
Material Innovation: Nanocrystalline cores for higher saturation flux
Automotive Focus: AEC-Q qualified parts for EV/HEV systems